Selway Forestsnail Allogona Lombardii

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Selway Forestsnail Allogona lombardii Gastropoda — Stylommatophora — Polygyridae CONSERVATION STATUS / CLASSIFICATION Rangewide: Critically imperiled (G1) Statewide: Critically imperiled (S1) ESA: No status USFS: Region 1: No status; Region 4: No status BLM: No status IDFG: Not classified BASIS FOR INCLUSION Rare rangewide. TAXONOMY No subspecies is recognized. DISTRIBUTION AND ABUNDANCE This terrestrial snail is endemic to Idaho. Historically, populations occurred in the Selway, Lochsa, lower Salmon, and upper Clearwater drainages. Isolated colonies currently exist along the lower Lochsa River, the Salmon River, the Selway River, and 1 Selway tributary. This species is considered to be rare (Frest and Johannes 1997). POPULATION TREND Current population trend is unknown. HABITAT AND ECOLOGY The Selway forestsnail inhabits intact mixed coniferous forests at various elevations. Sites are usually characterized as lower elevation, well-shaded, moist areas along medium to large streams with a substantial duff layer and a diverse understory. As a result of their habitat preferences, they are frequently found at the edge of flood plains. They have also been observed in areas with high land snail diversity (Frest and Johannes 1997). ISSUES The Selway forestsnail has relatively specialized habitat requirements; therefore any form of habitat disturbance may endanger remaining populations. Logging and grazing are thought to have impacted their habitat throughout their range. Road modifications within their habitat have occurred along the Selway and the Lochsa Rivers. Lastly, mining (limestone quarry) in the lower Salmon River Valley has removed a large portion of suitable habitat (Frest and Johannes 1997). RECOMMENDED ACTIONS Research that addresses population numbers, habitat status, conservation measures, and trends within their current distribution is necessary. Habitat and site-based actions should be implemented after a better understanding of population dynamics and current range is gained. Selway Forestsnail Allogona lombardii Ecological Section Point Locations 0 20 40 80 Kilometers 2 August 2005 Point data are from Idaho Conservation Data Center, Idaho Department of Fish and Game. 0 20 40 80 Miles.

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